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1 Resistance loop
Surface
voltage
Basic Charging
Laser Beam Exposure and
Developing
(a) Unexposed area
(b) Exposed area
Transfer image to paper
Drum unit
Time
3.
Developing
The developing process enables the toner to be attracted to the electrostatic image on the drum to form a
visible image.
The developing unit contains non-magnetic toner. The developing roller is a conductive rubber, and the
supply roller (also a conductive rubber) rotates toward each other. The toner is filled and transported from
the supply roller to the developer roller. The toner adheres to the developing roller and is conveyed to the
photosensitive drum with uniform thickness under the control of the blade. The toner is sandwiched between
the developer roller and the drum and develops on the hidden image on the drum.
The electrostatic area between the drum and the developing roller is biased by the DC power supply, and
the electrostatic voltage generated attracts the toner particles on the developing roller to the hidden image
area on the surface of the drum.
4.
Transfer
(1) The Transferring Process
After the drum unit is charged, exposed and received the developed image, the formed toner is transferred
to the paper by the negative charge on the back of the paper. The negative charge on the paper causes the
positively charged toner to leave the drum and stick to the paper. The result is a visible image on the paper.
(2) The Cleaning Process of the Transfer Roller
If the toner does not transfer well to the paper, the toner may be left on the toner cartridge and stuck to the
transfer roller. The transfer voltage changes when the drum is not printing. Therefore, the transfer roller can
be cleaned by returning the positively charged toner adhering to the transfer roller to the image-conducting
drum.
(3) Elimination of electricity
Remove the residual electricity on the surface of the photosensitive drum.
Confidential
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